.TH libssh2_userauth_publickey_fromfile 3 "1 Jun 2007" "libssh2 0.15" "libssh2 manual"
.SH NAME
libssh2_userauth_publickey_fromfile - authenticate a session with a public key, read from a file
.SH SYNOPSIS
#include <libssh2.h>

.nf
int libssh2_userauth_publickey_fromfile_ex(LIBSSH2_SESSION *session,
                                           const char *username,
                                           unsigned int ousername_len,
                                           const char *publickey,
                                           const char *privatekey,
                                           const char *passphrase);
.SH DESCRIPTION
\fIsession\fP - Session instance as returned by
\fBlibssh2_session_init_ex(3)\fP

\fIusername\fP - Pointer to user name to authenticate as.

\fIusername_len\fP - Length of \fIusername\fP.

\fIpublickey\fP - Path name of the public key file.
(e.g. /etc/ssh/hostkey.pub). If libssh2 is built against OpenSSL, this option
can be set to NULL.

\fIprivatekey\fP - Path name of the private key file. (e.g. /etc/ssh/hostkey)

\fIpassphrase\fP - Passphrase to use when decoding \fIprivatekey\fP.

Attempt public key authentication using a PEM encoded private key file stored
on disk

.SH RETURN VALUE
Return 0 on success or negative on failure.  It returns
LIBSSH2_ERROR_EAGAIN when it would otherwise block. While
LIBSSH2_ERROR_EAGAIN is a negative number, it isn't really a failure per se.

.SH ERRORS
\fILIBSSH2_ERROR_ALLOC\fP -  An internal memory allocation call failed.

\fILIBSSH2_ERROR_SOCKET_SEND\fP - Unable to send data on socket.

\fILIBSSH2_ERROR_SOCKET_TIMEOUT\fP - 

\fILIBSSH2_ERROR_PUBLICKEY_UNVERIFIED\fP - The username/public key
combination was invalid.

\fILIBSSH2_ERROR_AUTHENTICATION_FAILED\fP - Authentication using the supplied
public key was not accepted.

.SH SEE ALSO
.BR libssh2_session_init_ex(3)
